Did a visual check of the engine bay and found what looks like gnaw marks that were not there last time I checked.

Can anyone tell me what this tubing is responsible for?

 

 

I've had a look at that tube on my wife's 2015 Polo 1.2TSI 110PS, I'd think that that is a crankcase ventilation system pipe, I did not check completely, it is a hard shaped pipe, the hard part material I can not confirm is plastic or steel or aluminium, and it is sheathed in a closed foam material either to reduce noise or control temperature.  There is one or two "flattened" areas on that pipe even from new.

 

Edit:- that sort of material seems to be a favourite of field mice, ie firmish closed cell foam always black!  My S4 bits at the edge of the bonnet got attacked one year in the garage, my daughter's SEAT Ibiza SC got the same material in another place attacked outside on the driveway - I bought 6 mouse traps, bait them with cheap peanut butter(which is not a good idea if you are using poisons as it counteracts them it seems!), I prepare them in late October and "maintain" them until late April. Normally I find only one family or group of field mice chose our driveway and garage to winter in - so after despatching maybe 6 in total, the traps stay empty for the rest of the "season".  Nasty little bas---ds!

Edited 19 July, 20214 yr by rum4mo

16 minutes ago, rum4mo said:

I've had a look at that tube on my wife's 2015 Polo 1.2TSI 110PS, I'd think that that is a crankcase ventilation system pipe, I did not check completely, it is a hard shaped pipe, the hard part material I can not confirm is plastic or steel or aluminium, and it is sheathed in a closed foam material either to reduce noise or control temperature.  There is one or two "flattened" areas on that pipe even from new.

 

Edit:- that sort of material seems to be a favourite of field mice, ie firmish closed cell foam always black!  My S4 bits at the edge of the bonnet got attacked one year in the garage, my daughter's SEAT Ibiza SC got the same material in another place attacked outside on the driveway - I bought 6 mouse traps, bait them with cheap peanut butter(which is not a good idea if you are using poisons as it counteracts them it seems!), I prepare them in late October and "maintain" them until late April. Normally I find only one family or group of field mice chose our driveway and garage to winter in - so after despatching maybe 6 in total, the traps stay empty for the rest of the "season".  Nasty little bas---ds!

 

Thanks, that is useful.

We live on a farm so there are fields aplenty around our drive, your hypothesis about field mice seems on the money.